Influence of calcination temperature on selective catalytic reduction of NOx with NH3 over CeO2-ZrO2-WO3 catalyst
来源期刊：JOURNAL OF RARE EARTHS2015年第7期
论文作者：李军燕 宋忠贤 宁平 张秋林 刘昕 李昊 黄真真
文章页码：726 - 735
摘 要：A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction（SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure, surface acidity and redox behavior of CeO2-ZrO2-WO3 catalyst was investigated using various characterization methods. It was found that the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃ showed the best catalytic performance and excellent N2 selectivity, and yielded more than 90% NO conversion in a wide temperature range of 250–500 ℃ with a space velocity（GHSV） of 60000 h–1. As the calcination temperature was increased from 400 to 600 ℃, the NO conversion obviously increased, but decreased at higher calcination temperature. The results implied that the higher surface area, the strongest synergistic interaction, the superior redox property and the highly dispersed or amorphous WO3 species contributed to the excellent SCR activity of the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃.
李军燕1，宋忠贤1，宁平1，张秋林1，刘昕1，李昊1，黄真真2
1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology2. College of Environmental Science and Engineering, Hunan University
摘 要：A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction（SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure, surface acidity and redox behavior of CeO2-ZrO2-WO3 catalyst was investigated using various characterization methods. It was found that the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃ showed the best catalytic performance and excellent N2 selectivity, and yielded more than 90% NO conversion in a wide temperature range of 250–500 ℃ with a space velocity（GHSV） of 60000 h–1. As the calcination temperature was increased from 400 to 600 ℃, the NO conversion obviously increased, but decreased at higher calcination temperature. The results implied that the higher surface area, the strongest synergistic interaction, the superior redox property and the highly dispersed or amorphous WO3 species contributed to the excellent SCR activity of the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃.
关键词：
